SIXTH ASSIGNMENT: Rescue Pieter
This final assignment is a very easy one and it's also extremely short. Choose a machine from your inventory and proceed to the next room. One of the enemy soldiers will be hiding to your left [#150]. Kill him before he turns around and fights back. Once he's gone, proceed to the stairs to get to the first floor.
Keep heading forward. You won't encounter any enemy units along the way, so you don't have to act carefully. Turn right at the junction. Ignore all of the surrounding rooms. Your objective is the last room to your right [#151]. Try entering it and you'll watch a new cut-scene. This is the end of the mission. Get ready for the next one.